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I have found a anwser.

I have found a anwser.

Now, I place my solution here:

1.make a new directory and navigate to it, then create a new document.

$ sudo mkidr -p /etc/ros/rosdep/sources.list.d
$ cd /etc/ros/rosdep/sources.list.d
$ sudo gedit 20-default.list

2. go to the link 3. copy the contents from the link to the 20-default.list. which may like this:

# os-specific listings first
yaml osx   
# generic
gbpdistro fuerte   
# newer distributions (Groovy, Hydro, ...) must not be listed anymore, they are being fetched from the rosdistro 
index.yaml instead

4. replace the all the to in 20-default.list document, then save and close it. 5. run rosdep update